Malicious PDF — malware analysis report

Static analysis result for SHA-256 43193f758c4dff6a…

MALICIOUS

PDF

56.8 KB Created: 2021-10-04 05:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 531f60f0f0816c96af33cb224c70de2e SHA-1: 820fbb5ff9e48783d192de7c31845896913fa321 SHA-256: 43193f758c4dff6af2302e12fbde51f95c2b81939080a58d205f69b620638b0b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://myclubowners.travelenvogue.com/userfiles/files/kajugipuguvonuxebisapewo.pdf In PDF document text
    • https://aczv.fr/userfiles/file/penemax.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/23975124604.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/67919100460.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d714da6908753ef41d0b6ab40f7749c0/87667387012.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/76793424704.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/vaxupenizovufes.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/78295847566.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/wewikukomalagawelulo.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/20566245454.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/59699911857.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/7701403521.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/13385286258.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/4919856362.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/litobovaf.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/31320195758.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/4300568652.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/kiwejijetufekomedisosomu.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/52258045890.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/vegolopi.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/joniboxur.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/49896925559.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/33295590212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+area+under+the+normal+curve+to+the+right+of+u+equalsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF87 11196 bytes
SHA-256: 6891257426c34c06638991679c80aa9d78add1c0f07289be5ddb81c99bfc680a
font_01_sfnt_off0000c907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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